tcl is a standard program that is part of the distro for FC2 ... to see if you have it installed, use the command:

rpm -qa | grep tcl

Do you want to use BitchX for a specific reason, or are you just looking for an irc client? BitchX is not one of the IRC clients that are now distributed with Fedora Core, SUSE or Mandrake ... but there are other IRC clients available.

If you absolutely want BitchX, download the CVS version (which will compile on FC2), like this (as root from a terminal window):